Sounds awesome. Was wondering if any 135i axlebacks bolted up onto our 128's. Would 135i DP's or any other exhaust stuff fit with little to no modifications?

Don't think any 135i exhaust parts would fit without cutting and welding. If I don't find anyone selling the berk race axle back used, i'll be buying a new one as this is a really nice sounding option. Better than the BMW performance or magnaflow.